ABC/Ida Mae Astute(WASHINGTON) — Sen. Marco Rubio, R-Fla., said Monday for the first time during his re-election campaign that he would serve a full six-year term if re-elected to the Senate, but did not shut the door on another presidential bid.

In the first Florida Senate debate, moderated by ABC News’ Chief White House Correspondent Jonathan Karl, Rubio defended his record from criticism that he missed a significant number of hearings and votes in his first time while running for president.

“I’m going to serve in the Senate for the next six years, God willing,” Rubio said. “Not only am I going to serve in the Senate over the next six years, we’re going to get a lot done.”

“So, this means you’re not running for president?” Karl asked.

In his response, Rubio did not rule out a 2020 presidential run.

“I’m going to be a senator for the next six years on behalf of the state of Florida,” he said. “You can’t be a senator and president at the same time.”

Before Monday night, Rubio had not committed to serving a full second term in Congress.

Between July of 2015 and September of 2016, Rubio missed 104 of 270 Senate roll call votes, nearly 40 percent of all votes.